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So running the Pi in 64-bit is really overall beneficial. I'm running a customised version of Ubuntu for the Pi4. https://ubuntu.com/download/raspberry-pi http

So running the Pi in 64-bit is really overall beneficial. I'm running a customised version of Ubuntu for the Pi4. https://ubuntu.com/download/raspberry-pi https://ubuntu.com/download/raspberry-pi I've also customised the image by adding users, public keys and such. Removing some of the cloud cruft. These instructions make it very, very easy and you can do this on an x86 machine. Just make sure to use /usr/bin/qemu-aarch64-static (64 bits) instead of qemu-arm-static (32 bits). https://powersj.io/post/raspbian-edit-image/ https://powersj.io/post/raspbian-edit-image/

monocasa 7y ago
Depends on the Pi. The A53 based Pis did a little worse in 64 bit mode on average IIRC (probs because of the cache pressure).
mlyle 7y ago
The flipside is-- if you have a 1GB pi, you're going to be wasting a whole lot of RAM on wider pointers, and you may be more constrained by RAM than CPU throughput. (Also, 64 bit Pi is not nearly as well supported as 32 bit currently. Does hardware GL work yet? What about if you're going to do MIPI, etc?) IMO it's worth waiting for a little more maturity.
- DagAgren 7y ago
  Has nobody tried to implement an aarch64 equivalent of the "x32" ABI? That is, using the 64-bit instruction set but keeping pointers 32 bits long?
  - mlyle 7y ago
    There's Arm64ilp32, but I don't think it's in the mainline kernel and it's really bleeding edge/strange. When aarch64 is so badly supported on pi, it's really scary to go even further into the fringe with Arm64ilp32.
  - saagarjha 7y ago
    Not sure about Linux, but Apple has for Apple Watch…
- louwrentius 7y ago
  I have not used or had a need for hardware GL. Don't even know what MIPI is. I use it as very cheap bare metal. Still plan to use 3 of them as Ceph monitors.
  - guug 7y ago
    Sounds like you're using them as servers. Doesn't the lack of ECC worry you?
    - mlyle 7y ago
      Not everything needs ECC memory. Ceph monitors aren't in the data path and Paxos is robust against byzantine failure, so...
  - unwind 7y ago
    It used to be Mobile Industry Processor Interface [1] but no longer is used as an acronym. High-speed serial links for driving displays and cameras in cell phones, originally. Proprietary. [1] https://en.m.wikipedia.org/wiki/MIPI_Alliance https://en.m.wikipedia.org/wiki/MIPI_Alliance

monocasa 7y ago

Depends on the Pi. The A53 based Pis did a little worse in 64 bit mode on average IIRC (probs because of the cache pressure).

mlyle 7y ago

The flipside is-- if you have a 1GB pi, you're going to be wasting a whole lot of RAM on wider pointers, and you may be more constrained by RAM than CPU throughput. (Also, 64 bit Pi is not nearly as well supported as 32 bit currently. Does hardware GL work yet? What about if you're going to do MIPI, etc?) IMO it's worth waiting for a little more maturity.

DagAgren 7y ago
Has nobody tried to implement an aarch64 equivalent of the "x32" ABI? That is, using the 64-bit instruction set but keeping pointers 32 bits long?
- mlyle 7y ago
  There's Arm64ilp32, but I don't think it's in the mainline kernel and it's really bleeding edge/strange. When aarch64 is so badly supported on pi, it's really scary to go even further into the fringe with Arm64ilp32.
- saagarjha 7y ago
  Not sure about Linux, but Apple has for Apple Watch…
louwrentius 7y ago
I have not used or had a need for hardware GL. Don't even know what MIPI is. I use it as very cheap bare metal. Still plan to use 3 of them as Ceph monitors.
- guug 7y ago
  Sounds like you're using them as servers. Doesn't the lack of ECC worry you?
  - mlyle 7y ago
    Not everything needs ECC memory. Ceph monitors aren't in the data path and Paxos is robust against byzantine failure, so...
- unwind 7y ago
  It used to be Mobile Industry Processor Interface [1] but no longer is used as an acronym. High-speed serial links for driving displays and cameras in cell phones, originally. Proprietary. [1] https://en.m.wikipedia.org/wiki/MIPI_Alliance https://en.m.wikipedia.org/wiki/MIPI_Alliance